Code seems fine.
The inconsistency whether str.length() is parenthesized could add confusion.
You may prefer to compute str.length()-2 only once,
on the other hand str.length()-2 is so simple to compute

Code seems fine.
The inconsistency whether str.length() is parenthesized could add confusion.
You may prefer to compute str.length()-2 only once,
on the other hand str.length()-2 is so simple to compute that you may feel that an extra variable
adds more complication.

Doing that can often make it easier to understand as well. It might be even more meaningful if the variable is more descriptive. Since what you really want to do is substring from the index of the next to last character to the end concatenated with the substring from the beginning index to the index of the next to last character, you might want to name your variable idx and give it the index value -
int idx = str.length() - 2;
return str.substring(idx) + str.substring(0,idx);

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